NDLI: Adaptive response of single and binary Pseudomonas aeruginosa and Escherichia coli biofilms to benzalkonium chloride.

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Adaptive response of single and binary Pseudomonas aeruginosa and Escherichia coli biofilms to benzalkonium chloride.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Machado, Idalina Lopes, Susana Patrícia Sousa, Ana Margarida Pereira, Maria Olívia
Description	Country affiliation: Portugal Author Affiliation: Machado I ( IBB-Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.)
Abstract	The main goal of this work was to examine whether the continuous exposure of single and binary P. aeruginosa and E. coli biofilms to sub-lethal benzalkonium chloride (BC) doses can induce adaptive response of bacteria. Biofilms were formed during 24 h and then put continuously in contact with BC for more 5 days. The six-day-old adapted biofilms were then submitted to BC challenge, characterized and inspected by SEM. Both single and binary adapted biofilms have clearly more biomass, polysaccharides and proteins and less activity even though the number of cells was identical. After BC treatment, adapted biofilms maintained their mass and activity. SEM examination revealed that those adapted biofilms had a slimier and denser matrix that became thicker after BC treatment. Continuous exposure of bacteria to antimicrobials can lead to development of biofilms encompassing more virulent and tolerant bacteria. This adaptive resistance can be the result of a phenotypic adaptation, a genetic acquired resistance or both. Instead of eradicating biofilms and kill microorganisms, the use of a disinfectant can, favour biofilm formation and tolerance. This must be a genuine concern as it can happen in clinical environments, where the use of antimicrobials is unavoidable.
File Format	HTM / HTML
ISSN	0233111X
Issue Number	1
Volume Number	52
e-ISSN	15214028
Journal	Journal of Basic Microbiology
Language	English
Publisher	Wiley-VCH Verlag
Publisher Date	2012-02-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Microbiology Anti-infective Agents, Local Pharmacology Benzalkonium Compounds Biofilms Drug Effects Drug Resistance, Bacterial Escherichia Coli Pseudomonas Aeruginosa Adaptation, Biological Growth & Development Genetics Physiology Journal Article
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology

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